>> lance armstrong is on the course! >> reporter: cbs news learned the former cycling star confessed to winfrey what many already speculated that he used performance-enhancing drugs. the lengthy sitdown took place in the four seasons hotel in austin texas, where armstrong was joined by close friends and lawyers. afterwards oprah tweeted "just wrapped with lance armstrong, he came ready." he spent the better part of his career fighting back against doping allegations. >> we have nothing to hide. >> reporter: the pressure mounted in may 2011 when scott pelley talked to tyler hamilton about the blood boosting drug epo. >> you saw lance armstrong inject epo? >> yes, like we all did. like i did many many times. >> reporter: and last year the u.s. anti-doping agency issued a scathing report accusing armstrong of masterminding a sophisticated conspiracy roping teammates into his drug use and threatening anyone who stood in his way. just last week pelley spoke to the head of the anti-doping agency on "60 minutes sports." travis